Disk valve for rock drills



1,637,185 y 1927' c. c. HANSEN DISK VALVE FOR ROCK DRILLS Filed May 20, 1925 IN V ENTOR,

'l/ I W7. [/[SATTO NEYS.

Patented July 26, 1927.

UNITED STATES.

PATENT, OFFICEQ exams 0. mean or 'EAST N, PENNSYLVANIA, AssIeNon 'ro INeEnsoLL-BANIJ conm, or mnsnx crrr, NEW JERSEY, A CORPORATION or NEW JERSEY.

DISK VALVE FOR ROCK DRILL S.

Application Med May 20, 1925. Serial No. 81,486.

This invention relates to fluid actuated rock drills, but more particularly to an improved distributing valve for such drills.

The objects of the invention are to sima 'plify the construction of the valve and its parts, lighten the weight of the machine, and increase the drilling capacity.

- Further objects of the invention will here-. inafter appear and the invention is shown in one of its preferred forms in the acco1 n panying drawings, in which Figure 1 is a longitudinal sectional eleva; tion of so much of a rock' drill aswill serve to make the invention clear, and v Figure 2 is a detail longitudinal sectional plan view through the valve box on the lines 2--2 of Figure 1 looking inthe direction of the arrows.

- Referring to. the drawings, the cylinder A $0 and back head B are shown diagrammatically, and the piston C having the forward extension or shank D is preferably a hammer piston. e

Withthe type of valve to which this invention relates the cylinder A is provided with a free exhaust port E controlled only by the piston, and the valve F controls onl the inlet toreach end of the cylinder throng the inlet ports G and A valve chest '0 preferably located at the slde of the cyllnder comprises the block J havingpassages and L and the cover 0 havin a shallow C11- cular recess P forming a va ve chamber to receive .the plate valve Fin the form of a ll thin, flat circular oscillating disk having "a relatively broad, flat area. The cover 0 is formed with a flange O forming a stop for the valve. v

Pressure fluid is admitted from the sup- N ply Q and controlled by the usual throttle 'valve R and passes through the port S to thechamber of the valve box. The passages K and L connect the inlet ports T and U l with the cylinder inlet ports G and H respectively.

The oscillating disk valve F in the valve box is held against rotation about its longitudinal axis by means of the pins V enter-- in the notches W in the periphery of the W vs vs. In the present instance the pins V also serve to locate the valve box with respect to the cylinder. The'valve F- is substantially uniformly tapered from its median line,or diameter X towards the peri hery at each side and in' order that the va ve shall freely oscillate without binding, suittable clearance is provided in the valve chest. The valve rests in direct contact with the valve .seat along said median line to form a, fulcrum.- Suflicient clearance is also provided between the peripheries Y and Z of the valve and the valve chest to permit the live pressure fluid to pass'over the ends of the valve to the cylinder.

In the operation of the device, let it be assumed that the piston is traveling on its rearward stroke as shown in Figure 1, with the valve in the position indicated, in which case live pressure fluid is passing from the suppl Q to the valve chest and ,over the end of the valve and through the passa e L to the forward end of the cylinder. 8 the iston moves rearwardly and uncovers the ree exhaust port E pressure is reduced under the surface'of the valve at the right hand side which is raised in Figure 1, while the opposite end of the valveis subjected to compression taking place in the rearward end of the cylinder, which causes thevalve to oscillate and close the port U at the same time opening the opposite port T to supply live pressure fluid to the rearward end of K the cylinder for driving the piston forwardly.

This improved valve operatin on the current thrownprinciple 1s simp e,,compact,

strong and eflicient. The valve is made of sufficiently large diameter to provide large pressure surface and owing to its flat construction may be conveniently located at the side of the cylinder.

I claim:

A'fluid actuated rock drill comprising a cylinder and reciprocating piston, a ree exhaust port located centrally of the cylinder and controlled only by the piston, a valve box having a valve seat and a shallow circular bore forming a valve chamber located at the side of the cylinder, said valve box being formed with a flange forming a stop for the valve, a plate valve in the form of a thin fiat oscillating circular disk'having a relatively broad area in sand box, said valve disk having clearance at opposite edge portions and being uniformlytapered from against rotation about its longitudinal axis, its median diameter towards sald opposite and to locate the valve box with respect to edge portions, the valve lying indirect conthe cylinder, and inlet ports for the cylinl0 tact with the valve seat along said median der controlled onl by said valve.

6 line to form a fulcrum, said valve having In testimony whereof I have signed this notches at the ends of its median diameter, specification; pins entering said notches to hold the valve CHARLES C. HANSEN. 

